【摘要】 用溶胶-凝胶法和浸渍-提拉法工艺,在玻璃表面上制备了均匀、透明的钇离子(Y3+)掺杂二氧化钛纳米薄膜。用XRD分析了样品的晶相及其与热处理温度的关系,用X射线光电子能谱(XPS)分析了薄膜表面氧的状态,用可见光吸收光谱分析了涂膜层数对透光率的影响,用接触角仪测定了其亲水性。研究了Y3+掺杂本身和具体的掺杂量、光照强度和时间对薄膜亲水性的影响。研究结果表明,掺杂Y3+的二氧化钛纳米薄膜,在物质的量分数x(Y3+/Ti4+)=1.5%时,经紫外光照30min或自然光照1h后,与水的接触角小于5°,表现出超亲水性;与纯二氧化钛纳米薄膜相比,其超亲水性对光诱导更为敏感;在有实用意义的超亲水性的稳定方面也有明显的改善;这应部分地与固体化学所描述的Y3+掺杂所造成固定、额外并且是高浓度的氧空位有关。更多还原

【Abstract】 Homogeneous and transparent thin nanostructured titania films doped by Y3+were prepared on glass substrates by sol gel processing and dip coating technique. The films were characterized by XRD, XPS and visible absorption spectra. The hydrophilicity of the films was determined by measuring the water contact angles for the films. The effects of Y3+doping, the quantities of Y3+dopant, and the intensity and the time of light illumination on hydrophilicity of the films were studied. The results revealed that the film at a mole percent of x(Y3+/Ti4+)=1.5%had a water contact angle of less than 5°after UV illumination for 30min or sunlight for 1h, showing superhydrophilicity. The films behaved more sensitive to photoinduction and more significantly stable in superhydrophilicity, compared with the pure titania ones. This might partly be relative with the fixed, extra and highly concentrated oxygen vacancies resulted from Y3+doping, the mechanics of which were as described in the solid state chemistry.更多还原